Corn

Corn doesn't digest. I think you can figure out how I came to that conclusion.

2 Remarks:

red_herring said...

Frankly, I find it more interesting that you didn't know that already...

Also, I made a poem about that very subject once:

I had some corn last night
I had it in my soup
I had some corn last night
It came out in my poop

Sam said...

I knew that it didn't digest, i just never looked at my poop after eating corn. it was interesting.